Investigation of Molecular Mechanisms of Apoptosis using gene knock-out leukemic cell lines

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In order to investigate the molecular mechanism of how glucocorticoid (GC) induces apoptosis in certain leukemic cells, we established RCAN1 gene knock-out Nalm6 cells. RCAN1 is one of the target genes of GC and Nalm6 is a human leukemic cell line that undergoes apoptosis upon the treatment with GC. RCAN1 -/- cells were markedly resistant to GC compared with wild-type cells. On the contrary, overexpression of RCAN1 resulted in enhanced apoptosis by GC. These resultsdemonstrate that RCAN1 is a mediator for GC-induced apoptosis in leukemic cells.